Sisters With Cystic Fibrosis Light Up America's Got Talent 1.19K John Siegel 06/24/10 01:12PM Filed to: America's Got Talent America's Got Talent Cystic Fibrosis TV Video These two sisters scored big last night on America's Got Talent by singing their way to Las Vegas, despite both having Cystic Fibrosis. Watch as they describe the challenges facing them, then proceed to rock the house.